Pentair | 521377 | IntelliPH Controller - ¼ - inch SDS Mount, 4 Gallon Acid Reservoir

The Pentair IntelliPH (Model 521377) is an automatic pH controller designed to maintain proper water chemistry in pools by dispensing muriatic acid through a saddle-clamp feed. With a large 4-gallon reservoir and integrated controller panel, this system protects equipment from pH swings, enhances sanitiser performance, and reduces manual chemical handling.

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Key Features

• Genuine Pentair IntelliPH pH Controller (Model 521377)

• 4-gallon acid reservoir reduces refill frequency and enables longer unattended operation 

• Automatic acid dosing with adjustable rate via user interface 

• Designed for saddle-clamp mounting to ½″ diameter tubing (or as noted, 1½″ & 2″ options) 

• Equipped with pump-style lid to avoid acid spills and corrosion risk on equipment pad 

• UL and cUL listed for safe operation in pool mechanical rooms 

• Works in conjunction with Pentair IntelliChlor salt-chlorine generator systems or compatible pool automation systems

• Male/female socket for ½″ feed line and wall mounting hardware included for secure installation; suitable for residential and light commercial use

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Product Overview
The Pentair IntelliPH 521377 Controller offers a professional-grade solution for maintaining optimal pH levels in pool and spa systems. By integrating a dedicated acid feed system with automatic control, this unit eliminates frequent manual dosing, protects sensitive equipment from corrosion caused by pH fluctuations, and ensures chlorine sanitization remains effective.

With its sizable 4-gallon reservoir and enclosed housing, the IntelliPH simplifies maintenance and enhances safety by preventing acid spills on the equipment pad. Its saddle-clamp mounting and tubing connection enable flexible installation in retrofit or new builds. For pool professionals, the IntelliPH 521377 is a reliable, automated pH control choice that supports long-term equipment health and consistent water quality.